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BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: Jun 2014 Posts: 1 Moderated | | Moderated Joined: Jun 2014 Posts: 1 | I am hoping to match a 4 speed transmission (casting 590470) that came out a truck with an open driveshaft to a 1946 1/2 ton pickup with a torque tube driveshaft.
Do I need some sort of adapter on the rear of the transmission? The transmission has 10 spline shaft and the torque tube has 17 spline shaft. | | | | | Joined: Aug 2005 Posts: 270 'Bolter | | 'Bolter Joined: Aug 2005 Posts: 270 | I am not familiar with the 4 speed you have so this is my best guess. The only 4 speed that I know of that is available with an adapter for a torque tube is an SM420. This transmission is about two inches longer then the original 1946 transmissions, and would require shortening the torque tube or moving the engine. Not a good option. The usual approach is to use an open drive shaft. This would require using an open drive shaft differential pumpkin from a 54-62 half ton. | | |
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